Centrifugal governor for steam-engines.



S. ROSENZWEIG. CENTRIFUGAL GOVERNOR FOR STEAM ENGINES.

APPLlcATloN mep A111118, 1912.

15119111011 sept. 11,1911?.

2 SHEETS-SHEET l.

s. ROSENZWUG.

CENTRIEUGAIL GOVERNOR FOR STEAM ENGINES.

Patnted Sept. 1l, 1917.

2 SHEETS-SHEET 2.

@Mum/14:0?, Y* @www APFLICATION FILED APRI8| 1917.

f ffmwz W95 slrnerRrRn Rosnnzwnia oi;1 NRW YORK, 1v. Y.

CRNTRIRUGAL GOVERNOR ROR STEAM-ENGINES.

specification. of Lettersraterit. Patented Sept. fr, 199i? appiiqation inea april is, lei?.` serial ne. icas/is.

To all fwtom t may concern:

Be it, knevn that l,` Snaren-f1) RQSEN- awnie, a citizen 0f the United States, residing in New York city, in the county and State of New York, have invented a certain new and useful Improvement in Centrifugal Governors for Steam-Engines, of `which the following is a specification. i

My invention relates tothat ,class` of centrifugal speed governors for steam engines, in which there are two pendulums, pivotally connected to the governor body-which Ais keyed to and revolves with `the engine Shaft-and combined with a longitudinally curved flexible spring strip having one end inediately or immediately attached to the governor body, and the other or free end connected to the pendulnms and subjected to the centrifugal forces thereof, the stress or tension of the spring resisting the centrifugal forces of the pendulums, and the speed of the engine, for a given weight of pendulums, depending upon the resistant `force of the spring--the speed of the engine increasing with the increase in the initial stress or tension of the spring, and vice versa.

. The Object of my invention is to produce a simple and eflicient governor of this type in which the speed adjustment can readily be effected by hand whether the governor be at rest orin motion, and in which the working length of the spring will be automatically varied for the purpose of varying its stiffness, conformably to the changes in the stress or tension of the spring effected through the intermediary of said hand-operated speed-adjustment means. i l am aware that, in case of the adjustment of the stress or tension of said spring'in the direction of increasing said stress or tension, with a view to increase the speed of the engine, it has been proposed to providemeans by which the effective length of spring may, in these circumstances, be shortened with a view to enhance its stiffness as desired,` and this I do not broadly claim. My invention resides in the combination and arrangement of instrumentalities, for the purposes herein before stated, illustrated inthe accompanying drawings, to which I shall now refer for a better understanding of the improvement. I shall first describe thestructur'e embodying the improvement in connection with said drawings, and will then point ont in the claims those features thereof' which I believe to` be new and of my own invention.

la the Cheville-Sr Figure l is a vertical axial section partly in elevation ofthe governor and so much of the parts with which it is immediately associated as required for the purposes of explanation `F 2, is a side elevation of the governor locking atit from the left, the governor shaft and governor casing being in section.

Fig. 3 is a like elevation of the governor looking at it from the right, with the governor casing removed, and the governor shaft in section. t

Fig. el. is a section on line L -4 Fig. 3.

Mis the governor shaft and N is the body of the governor keyed as usual to, and revolving with, the said shaft. At diametrically opposite positions` on the governor body are located pendulums A, B, connected to the governor body by pivot pins C, D, respectively. From the hubs of the pendulums extend inwardly arms m shown in Fig. l and in dotted line in Fig. 2, in the outer ends of which are guideways n for sliding blocks n rotatably mounted on p ins j), the ends of which are journaled between disks Q, g', connected to move in unison and revolubly mounted on the shaft M. From: the outer face of the larger disk g projects an eccentric pin r, carrying in its outer end a swivel block s which is mounted and can slide the slot t the shif'table eccentric fz; which is connected to and adapted to operate the valve 'gear of the engine and is mounted on the smaller eccentric Iw `which is fixed to and revolves with the engine shaft. The movement of thependulums on their pivots will occasion corresponding movement of their operating arms fm, which, through the described mechanism intervening between them and the shiftable valve gear eccentric o, will shift the latter on its operating fixed eccentric to to regulate the cut-off in the usual manner. Thus far there is nothing new in the governor.

F is a flatv longitudinally curved spring stijipfone end of which is hooked over or otherwise attached to an'inwardly extending projection E cast on or otherwise atflhed to the hub of one of the pendulums- `in this `instance the pendulum B. The spring then is passed, in approximately circular path, and in a direction opposite to the pull which the pendulum projection E exercises on it during the outward swing of the pendulums, up, over and down on the other side of the governor shaft M where its other end is bolted or otherwise suitably se cured to the free end of a swinging arm Gr. This arm is eccentrically pivoted to the governor body at g; it thence extends in a. curved path around and partly encircling the engine shaft, so as to bring its free end (to which one end of the spring is attached as already indicated) on the other side of the engine shaft from the pivot g, opposite to and at a suitable distance from the projection E to which the other end of the spring is secured. By swinging the arm Gr toward or away from the projection E, the stress of the spring will be correspondingly varied, as will be understood without further explanation. rl`he eccentric mounting of the arm G with reference to the governor shaft enhances the efficiency of the device, inasmuch as for a given length of movement ofthe arm toward the pointE where the other end of the spring is located, a greater curvature of the spring will result than would be the case were said arm mounted to move concentrically with the governor shaft. Besides which the said arrangement permits of a very simple and effective means of adjusting the stress of the spring,

whether the governor be in motion or at rest.

Said means comprises a tubular thimble H mounted on and fitting the governor shaft and adapted to rotate therewith, and hav-k ing a wedge or tapered front end 7L which J which encircles While not contacting with, the governor shaft and is externally screw-threaded to engage the correspond ingly internally screw-threaded housing K attached to the adjoining governor shaft bearing K. Anti-friction washers y" or other suitable means for reducing friction and wear are interposed between the adjoining ends of the adjusting sleeve and the thimble. Upon the adjusting sleeve J vis keyed a hand wheel L for rotating it, and thus moving the beveled thimble lengthwise of the governor shaft according to the direction of rotation of the adjoining sleeve.

By turning the hand wheel in a direction to advance thejtapered thimble H toward the governor body, between the arm G and the governor shaft, the arm will be swung outwardly, thus causing the free end of the said arm to which one end of the spring is attached to be moved toward the projection E to which the other end of the spring is attached, which effects an increase in the stress or tension of the spring with consequent increase in the speed of the engine. Movement of the hand wheel in the opposite direction will produce the contrary effect.

Vhile the arrangement thus far described ,is very effective to vary the engine speed within certain limits, yet excessive stress on f Lthe spring may causethefgovernorl to bef come what is termed unstable, and lose its f speed control capacity. It has been found that this defect can be remedied by providing means whereby the spring may be made stiffer when increasing its stress. Inasmuch as the increase in stilfnessof the spring can enters between the governor shaft and the y he secured by shortening its working length,

portion of the swinging spring adjusting j I have provided for' this purpose a simple arm Gr which adjoins and partly encircles but effective device whereby the working the governor shaft, said thimble when its@ ,length of the spring is automatically varied tapered or wedge shaped end 1s pushed for- "to conform to the stress or tension of the ward or advanced between the arm Gr and the governor shaft acting to swing the said arm outwardly or away from the governor shaft, with the effect of moving the free end of the arm nearer to the point E, andthus correspondingly increasing the stress of the spring. On the inner face of the arm G at the point where it contacts with the beveled face of the thimble H is a projecting bearing lug g suitably formed to contact with the beveled end of the thimble and to permit the longitudinal movement of the latter without cramping or undue friction. The thimble H is connected to an annular coupling ring I by an annular tongue and groove connection (the tongue i on the coupling and the groove 7L in the thimble), which will permit the thimble to revolve freely with the governor shaft independently of the coupling ring. The coupling ring extends out through the side of the casing and' is lixed to an adjusting vsleeve spring, consisting of an arm R cast in one with, or otherwise suitably fastened tight to, the body of the governor-preferably the hub of the governor body as shown in Fig. 3-and extending outwardly therefrom until its outer end meets and vbears against the under face of the spring at any given distance from the point of attachment of the spring to the swinging arm Gr. The stress of the spring will hold it tight down upon the end of arm R which furnishes a bearing that in effect determines the eective working length, or length of the effective workcreased, with a like increase in the idle length of the spring between the points R and G, and decrease in the active or eifective working length of the spring and consequent increase in its stiffness. The bearing point on the arm R over which the spring passes may be provided with a roller R to reduce friction. The arm R being rigidly secured tohthe governor body always occupies the same position thereon notwithstanding the pressure of the spring upon itl which tends to pull it in the direction of the longitudinal movement of the spring that takes place in changing the stress or tension of f the same, thus permitting the ready and accurate adjustment of the spring whether the governor be in motion or at rest.

Having described my improvement and the best way now known to me of carrying the same into practical effect, I would state in conclusion that I do not limit myself narrowly to the particular structural details herein before shown and described, since manifestly the same can be varied to some extent without departure from the spirit of my invention: But what I claim as new and desire to secure by Letters Patent is:

l. In a steam engine governor, the combination with the governor shaft, the governor body revolving therewith and the centrifugal pendulums pivoted to the governor body at diametrically opposite points on the same; of a swinging arm pivoted to the governor body eccentrically with reference to the governor shaft and thencefextending crosswise of said shaft in a curved path around and partly encircling the same so as to bring the free end of the arm on the other side of the shaft from the point at which said arm is pivoted to the governor body; a spring extending in a curved path around the governor shaft, secured at one end to the free end of the eccentrically pivoted arm, and at its other end to that one of the pendulums whose pivot adjoins the free end of said arm; and adjusting means for moving said eccentrically pivoted arm in one direction or the other to vary the stress of the spring as desired and for holding the thus-moved arm in its adjusted position.

2. In a steam engine governor, the combination with the governor shaft, the governor body revolving therewith, and the centrifugal pendulums pivoted to the governor body at diametrically opposite points on the same; of a swinging arm pivoted to the governor body eccentrically with reference to the governor shaft and thence extending crosswise of said shaft in a curved path around and partly encircling the same, so as to bring the free end of the arm on the other side of the shaft from the point at which said arm is pivoted to the governor body; a spring extending in a curved path around the governor shaft, secured at one end to the free end of the eccentrically pivoted arm, and at its other end to that one of the pendulums whose pivot adjoins the free end of said arm; a tubular wedge-like thimble interposed between opposed faces of the eccentrically pivoted arm and the governor shaft, mounted on the latter, and slidable lengthwise of the same to vary the interval between said shaft and arm; and manually operable means, operatively coupled to said wedge-like thimble for thusmoving it and holding it in its adjusted po sition.

3. In combination with the elements specified in claim l, the arm R rigidly secured to the governor body and bearing at its outer end against the under face of the curved spring at a predetermined distance in advance of the point of attachment of said spring to the free end of the eccentrically pivoted swinging arm, substantially as and for the purposes herein before set forth.

In testimony whereof, I aiiix my signature in presence of two witnesses.

SIEGFRIED ROSENZWEIG.

Witnesses:

J. F. WITMAN, O. H. SHAFFER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of latents, Washington, D. G. 

